Disk device and method of generating signal representing head

Abstract

A signal processing device for analog-to-digital converting a burst signal has a feature of selecting a data bus to notify a disk control device of a conversion result via an NRZ data bus. The disk control device stores the result of the analog-to-digital conversion of the servo positional signal. The positional signal of a head of the disk device is digitized in a R / W channel. Sampling for digital conversion is performed in only a window which is defined only in the vicinity of peaks of the positional signal. The values of peaks which are obtained by sampling are averaged by an averaging circuit. This enables the influence of noise occurred outside of the window to be eliminated. Although the noise in the window is sampled, its adverse influence is suppressed by the averaging processing.

Description

[0001]This is a continuation application of U.S. Ser. No. 10 / 200,509, filed Jul. 23, 2002, now U.S. Pat. No. 6,563,656; which is a continuation application of U.S. Ser. No. 09 / 716,326, filed Nov. 21, 2000, now U.S. Pat. No. 6,445,522; which is a divisional application of U.S. Ser. No. 08 / 857,171, filed May 15, 1997, now U.S. Pat. No. 6,172,828.BACKGROUND OF THE INVENTION[0002]a) Field of the Invention[0003]The present invention relates to a disk device, and in particular to a circuit for processing servo information and a method of generating a signal representative of the position of a head for reading / writing data in an auxiliary storage of an electronic data processing device using a disk type storage medium.[0004]b) Description of the Related Art[0005]As personal computers have recently been improved in performance and their costs have been reduced, data storage devices, in particular magnetic disk devices, are strongly demanded to provide a large quantity of storage capacity an...

AI Technical Summary

Benefits of technology

[0052]Accordingly, it is an object of the present invention to provide an economical and highly reliable disk device in which the above mentioned problems are overcome by optimizing the configuration of the circuit in the disk device to provide a lay-out having a high noise margin.

[0053]It is another object of the present invention to provide a disk device or an electronic circuit for the disk device in which its cost is reduced by optimizing the configuration of circuits of the signal processing device, servo control unit and drive I / F control unit.

[0054]It is a further object of the present invention to provide a disk device or an electronic circuit for the disk device in which a high reliability is provided by optimizing the configuration of circuits of the signal processing device, servo control unit and drive I / F control unit.

[0056]It is a further object of the present invention to provide a disk device or an electronic circuit in which its reliability is enhanced by suppressing occurrence of noise when analog-digital conversion of the burst signal is conducted in the signal processing device.

[0068]It is a further object of the present invention to provide a storage device and a method of producing positional information of a head which has a high immunity against noise and is capable of detecting a positional signal in a high accuracy.

[0088]The processing circuit performs averaging processing of a positional signal (for example, an operation of an average value of peak values, operation of an average value of peak-to-peak values and an operation of square average of peak values) and obtains positional information based on a value which is obtained by the averaging operation. In this case, the averaging processing may be performed over only peak values which are larger than a predetermined value. It may be performed after the positional signal has been digitized by A / D converting means. If a PR equalizer is provided at a stage subsequent to the A / D converting means, the averaging processing may be performed over an output value of the PR equalizer. If the processing circuit includes a PR equalizer and a learning circuit having an averaging circuit for optimizing the PR equalizer, an increase in the number of circuits is prevented by performing the averaging processing by the averaging circuit of the learning circuit.

Problems solved by technology

Operation noise will give an adverse influence to the A / D converter 24.

This results in an increase in manufacturing cost.

This is not a good idea.

If the CPU serial I / O 92 shown in FIG. 2 is used at this time, it would take a longer period of time to read the burst registers so that it is not suitable for fast servo control.

Another problem will occur in this case.

There is a risk that the A / D converter 24 of the signal processing device 12 will malfunction due to influence of the noise.

In order to prevent this malfunction, the price of the device may increase due to additional circuits.

This leads to an extension of the time constant, an increase in the number of parts for servo control, a reduction in storage area for data, and a reduction in format efficiency of the medium.

Images